I recently obtained a broken Game Gear for the purpose of salvaging its cart slot. I have it broken down all the way to the main board, but now I am stuck.

There appear to be two metal eyelets/rivets that reinforce the slot. I can't figure out how to remove them without damaging the outer plastic frame. (It appears that the official MS plug in leaves notches for the plastic frame to attach to, otherwise I would just take a Dremel to the frame.)